LAREDO, Texas — A U.S. program that offers trusted trucking companies speedy passage across American borders has begun attracting the sort of customers who place a premium on avoiding inspections: Mexican drug smugglers.
Most trucks enrolled in the program pause at the border for just 20 seconds before entering the United States. Nine out of 10 of them do so without anyone looking at their cargo.
But among the small fraction of trucks that are inspected, authorities have found multiple loads of contraband, including eight tons of marijuana seized during one week in April.
Some experts now question whether the program makes sense when drug traffickers are willing to do almost anything to smuggle their shipments into the U.S.
The trusted-shipper system ''just tells the bad guys who to target,'' said Dave McIntyre, former director of the Integrative Center for Homeland Security at Texas A&M University.
The program works like this: Participating companies agree to adopt certain security measures in exchange for fast entry into the U.S. They are required to put their employees through background checks, fence in their facilities and track their trucks.
They also are asked to work with subcontractors who also have been certified under the program, which is run by the U.S. Customs and Border Protection agency.
The government keeps the list of participants secret, citing national security and trade secrets. But some of the 9,500 companies that are part of the system advertise their membership to drum up business, making them targets for smugglers, who can then threaten drivers or offer them bribes.
More than half of all U.S. imports now come from companies in the program, called the Customs-Trade Partnership Against Terrorism, or C-TPAT. Mexican trucking companies make up only 6 percent of global membership in the system, but they account for half of its 71 security violations during the past two years.
Mexican trucking companies face higher scrutiny than others. They get a full customs inspection every year, instead of every three years like other participating companies.
The most common contraband is marijuana, officials say.
In a 24-hour period in April, customs officers in Laredo found three tons of marijuana in trucks carrying auto parts across two bridges. Five days after that, agents in El Paso found more than four tons of marijuana in a tractor-trailer hauling auto parts.
In July, the director of the program became alarmed by the number of large drug seizures along the border and issued a security bulletin asking participating companies to redouble their efforts against smuggling.
Stephen Flynn, senior fellow for Counterterrorism and National Security Studies at the Council on Foreign Relations, said truckers do not feel safe rejecting bribes, no matter what agreements their companies have made with the U.S. government.
' 'The basic vulnerability for a truck driver remains the 'plata-or-plomo' dilemma,'' Flynn said, using Spanish shorthand for taking a bribe or a bullet.
In Laredo, the border's busiest crossing, nearly 700 trucks a day pass through the lane at the World Trade Bridge reserved for trucks that are certified by the trusted-carrier program.
Trucking companies have to electronically submit a list of each vehicle's cargo to customs officials at least 30 minutes before arriving at the bridge. Customs agents review them for risk factors that could trigger an inspection.
Customs will not reveal those factors, but people familiar with the program say potential risks are judged based on the factory that is sending the goods, its location, the truck's route and other matters.
Required cable locks on the trailer doors are also checked, but smugglers have been known to cut them and carefully glue them back together or take the trailer doors off at the hinges without disturbing the locks.
Daniel B. Hastings Jr., owner of a customs house with offices at five ports of entry on the Texas-Mexico border, thinks the customs program works. He cited cases where a Mexican trucking company tracking a truck noticed an unscheduled stop en route to the bridge and phoned to alert U.S. customs.
' 'I think they're doing as good as they can with what they have to work with,'' he said.